:root {
  --bg: #f3f7ff;
  --card: #ffffff;
  --primary: #2f6bff;
  --text: #1a2340;
  --sub: #5f6b8a;
  --danger: #ef4444;
  --ok: #16a34a;
  --warning: #f59e0b;
  --border: #dfe7ff;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: linear-gradient(140deg, #f8fbff 0%, #eaf0ff 100%);
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
  min-height: 100dvh;
  display: flex;
  justify-content: center;
  overflow-x: hidden;
}

.app-shell {
  width: min(100%, 430px);
  margin-inline: auto;
  padding: 12px 12px calc(14px + env(safe-area-inset-bottom));
}

.hero {
  background: radial-gradient(circle at right top, #7ba2ff, #2f6bff);
  color: #fff;
  padding: 16px;
  border-radius: 14px;
  box-shadow: 0 8px 20px rgba(47, 107, 255, 0.2);
}

.hero h1 {
  margin: 0 0 6px;
  font-size: 22px;
}

.hero p {
  margin: 0;
  font-size: 14px;
  opacity: 0.95;
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 12px;
}

.card {
  background: var(--card);
  border-radius: 14px;
  padding: 14px;
  border: 1px solid var(--border);
  box-shadow: 0 5px 16px rgba(31, 55, 128, 0.06);
}

h2 {
  margin: 0 0 12px;
  font-size: 16px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

label {
  display: grid;
  gap: 6px;
  font-size: 13px;
  color: var(--sub);
}

input,
select,
button {
  font: inherit;
}

input,
select {
  min-height: 44px;
  border: 1px solid #cad8ff;
  border-radius: 10px;
  padding: 10px 12px;
  background: #fff;
  font-size: 16px;
  appearance: none;
  -webkit-appearance: none;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(47, 107, 255, 0.15);
}

button {
  min-height: 44px;
  border: none;
  border-radius: 10px;
  padding: 10px 14px;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  font-size: 15px;
}

.btn-secondary {
  background: #eef3ff;
  color: #2f4fb0;
}

.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.stats div {
  background: #f7f9ff;
  border: 1px solid #e6edff;
  border-radius: 10px;
  padding: 9px;
  display: grid;
  gap: 4px;
}

.stats span {
  font-size: 12px;
  color: var(--sub);
}

.stats strong {
  font-size: 20px;
}

.tip {
  margin-top: 10px;
  padding: 10px;
  border-radius: 10px;
  font-size: 13px;
  background: #f5f7ff;
  color: #34406c;
}

.tip.ok {
  background: #ecfdf3;
  color: #0f7a36;
}

.tip.warn {
  background: #fff7e8;
  color: #9a6000;
}

.tip.danger {
  background: #fef0f0;
  color: #b42318;
}

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

#trend-canvas {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
  background: #fcfdff;
  border: 1px solid #edf2ff;
}

.chart-legend {
  margin: 8px 0 0;
  color: var(--sub);
  font-size: 12px;
  line-height: 1.5;
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
}

th,
td {
  text-align: left;
  border-bottom: 1px solid #ebf0ff;
  padding: 10px 8px;
  font-size: 13px;
}

.delete-btn {
  min-height: 34px;
  background: #fff1f1;
  color: #be123c;
  padding: 6px 10px;
  border-radius: 8px;
}

@media (min-width: 768px) {
  body {
    align-items: flex-start;
  }

  .app-shell {
    width: 430px;
    max-width: 430px;
    padding: 16px 14px 18px;
  }

  .hero {
    padding: 18px;
    border-radius: 16px;
  }

  .hero h1 {
    font-size: 24px;
  }

  .hero p {
    font-size: 14px;
  }

  .grid {
    grid-template-columns: 1fr;
    gap: 14px;
    margin-top: 14px;
  }

  .card {
    border-radius: 16px;
    padding: 16px;
  }

  h2 {
    font-size: 17px;
  }

  .form-grid {
    gap: 12px;
  }

  label {
    font-size: 14px;
  }

  .stats {
    gap: 10px;
  }

  .stats div {
    border-radius: 12px;
    padding: 10px;
    gap: 6px;
  }

  .stats span {
    font-size: 13px;
  }

  .stats strong {
    font-size: 22px;
  }

  .tip {
    margin-top: 12px;
    font-size: 14px;
    padding: 10px 12px;
  }

  .chart-legend {
    margin-top: 10px;
    font-size: 13px;
  }

  table {
    min-width: 620px;
  }

  th,
  td {
    font-size: 14px;
  }
}